William w



(ModeL) W. W. VANCE. DEVICE FOR HOLDING DENTAL DRILLS 0N WHETSTONES.

No; 289,472. Patented D60. 4, 1883.

WITNESSES Attorney! WILLIAM w. vnnon, or KEARNEY,

PATENT OFFICE;-

NEBRASKA, ASSlG-NOR or ONE-HALF TO FRED Y. ROBERTSON, OF SAME PLACE.

DEVICE FOR HOLDING DENTAL DRl LLS 0N WHETSTONES.

SPECIFICATION forming part of Letters Patent No. 289,472, dated December 4, 1883.

Application filed September 19, 1883. (Model.)

To aZZ whom, it may concern:

Be it known that I, WILLIAM W. Vance, a citizen of the United States, residing at Kearney, in the county of Buffalo and State of Nebraska, have invented a new and useful Device for Holding Dental Drills on Whetstones, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to devices for holding and supporting drills in position for sharpening and grinding upon a whetstone;j and it consists of the improved construction,fully described hereinafter, whereby the drills are easily sharpened and ground true and the manipulation of the same during said operationseasily effected.

In the accompanying drawings, Figure 1 represents, in perspective, a device for holding drills in position for sharpening or grinding, constructed in accordance with my invention and Fig. 2, a cross-section of the same.

A represents a rectangular block constituting the body of the holder,which block is provided with a horizontal groove, a, on one of its faces, B, and also with an inclined groove, 1), commencing from the top of the block and extending down diagonally to a point intersecting the horizontal groove a. .A perforation, 0, decreasing in diameter, passes diagonally through the block from the rear to the front thereof, where it terminates near thelower corner of the diagonal .grooveb, at the point of its junction with thehorizontal groove a. The drill O is placed within the perforation 0, so that the end to be sharpened or ground proj ects from the front face of the block, in which position it is rigidly retained by a plate, (I, which is laterally inserted in the groove a, so as to have the edge of said plate bear tightly against the under side of the drill, dropping out or accidental displacement of the plate being prevented by having the horizontal edges of the said plate d bearin recesses c therefor, communicating with the groove. An angleplateff, comprising a straight portion, the lower end, h, of which. is preferably beveled, and curved outer portion, is adapted to exert a clamping force on the face of the drill by having its said straight portion 9 passed into l a diagonal groove, 1), so as to permit itslower beveled end, h, to bear on the upper face of the drill when the curved outer portion, j, is depressed, by the finger of the operator, upon the upper end face of the rectangular block A, the curved form of the said horizontal portion imparting thereto a springmovement, the resiliency of which will tend to withdraw the clamping-face of the vertical portion 9 of the angle-plate f when the pressure of the finger of the operator is removed. Recesses k, communicating with the diagonal groove b, percesses 0 do for the plate d.

The drill for sharpening being secured in position, as hereinbefore described, the operator holds the block so that the thumb supports the side of the same, while the indexfinger depresses the spring end of the angle plate f, causing the beveled face h of the verface of the drill, the side of the middle finger of the hand resting in a recessed portion, 1), of the block, so as to secure a more comfortable hold thereof, and the block is then moved rapidly back and forth, causing the drill to pass over the surface of the Whetstone. It will be seen that the decreasing diameter of perforation cwill to a great extent hold the drill in place, the plates at f serving the function of a clamp, whereof the plate (1 forms the stationary jaw, and the other plate, f, acts as a movable jaw. Thus the said clamping-plates will securely hold the drill in conjunction with the perforation c, the plates exerting afirm springlike pressure upon the drill, as above set forth. By removing the horizontal plate (1 the drill can be easily revolved in the perforation a, so as to bring the upper face of the same in position for grinding or sharpening. Platesl an, arranged in grooves in a face, D, of the block A, (in connection with a second diagonal perforation, c,) but in-reverse of the plates d and f, not only permit of the insertion of more than one drill at a time in the holder for successive sharpening, but afford a spring-bearing at each end for the fingers of the operator.

By the employment of the device above described the sharpening and grinding of the drills may be effected with ease and precision.

form the same office forthe plate f as the re- 7 0 tical portion thereof to bear upon the upper I claim 1. In a device for holding and supporting drills for the purpose herein described, a block having a perforation for receiving the drill, said perforation decreasing in diameter and intersecting a groove 011 one of the faces of said block, and a plate adapted to be slid into said groove, so as to bear against one of the faces of the drill, as set forth.

2. In a device for holding and supporting drills on whetstones, a block having a perforation for receiving the drill, a groove on one of the faces of the block, a plate, d, adapted to be slid in said groove, so as to bear against one of the faces of the drill, and a plate, f,

having a spring-head or outer end, j, and a vertical portion, 9, resting within a groove, 12, substantially as set forth.

3. In a device for holding and supporting drills for the purpose herein described, a 20 block, A, recessed at one of its upper sides and provided with a perforation, c, and with grooves a b, adapted to receive clamp-plates d f, substantially as described.

In testimony that I claim the foregoing as 25 my own I have hereto affixed my signature in presence of two witnesses.

WILLIAM w. in non.

Witnesses:

W. W. BARNEY, H. I). GILBERT. 

